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manjeet

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· 1 Months ago

solution (Question: 179725.0 )

sir why we are multiplying with two in the canvas length

Question:
A circus tent is cylindrical to a height of 3 metre and conical above it. If the diameter of the base is 140 metre and the slant height of the conical portion is 80 metre, then the length of the canvas of  2 metre width required to make the tent  is:
Options:
A) 8960 metre.
B) 9660 metre.
C) 9460 metre.
D) 9860 metre.
Solution:
Length of the canvas x 2

= curved surface of the (cylinder + cone)

2 \(\pi\) rh + \(\pi\)rl

= 2 x 22/7 x 70 x 3 + 22/7 x 70 x 80

= (13220 + 17600)m2 = 18920 m2 

length of the canvas = ( 18920 \(\div\) 2) = 9460m

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